Question

The resistance of a 1m long nichrome wire is 6 $\Omega$. If we reduce the length of the wire to 70 cm. What will its resistance be?

Answer 1

$R=\rho \frac{L}{A}$
$R$ is directly proportional to $L$
$6ohm$ when length is $1m$
When length$7cm=\times 61\times 0.7$
$=4.2ohm$.